Drying apparatus.



A. GERLAGH.

DRYING APPARATUS.

APPLICATION FILED JULY 27, 1911.

Patented Jan. 30, 1912.

)1 Fig.4.

Wa'iness es;

5% E Md ALBERT GEBLACH, OF NORDHAUSEN, GERMANY.

DRYING APPARATUS.

Specification of Letters Patent.

Patented Jan. 30,1912.

Application filed July 2'7, 1911. Serial No. 640,756.

To all whom it may concern:

Be it known that I, ALBERT GERLACH, a subject of the German Emperor, andresiding at Nordhausen, Germany, have invented certain new and usefulImprovements in Drying Apparatus, of which the following is aspecification.

My invention relates to drying apparatus having stationary heatingsurfaces, and a primary object is to distribute large heating surfacesin a small chamber while preventing the materials to be dried adheringto the heating surfaces.

A further object is simultaneously to increase the safety of working anddurability of the apparatus owing to the omission of all stuliing-boxeswhich cannot be done without in apparatus comprising rotatable heaters.

To these ends, I arrange centrically in a steam-heated trough ahorizontal, stationary, cylindrical heater whose inner and outer heatingsurfaces are completely utilized for heating.

One illustrative embodiment of my invention is represented by way ofexample in the accompanying drawing, wherein Figures 1 and 2 arevertical transverse sections of two forms of my invention. Fig. 3 is avertical longitudinal section of the form shown in Fig. 1 and Fig. 4 isan end elevation thereof partly in section.

Referring to Figs. 1 and 3 the letter 6 designates my heater arrangedcentrically in the steam-heated trough d. The material to be driedentering into the apparatus at one end at 0, passes into the interior ofthe double-walled, steam-heated cylinder e and is here seized by arapidly rotating system of blades f which throw it toward all sides andsimultaneously continuously scrape ofi any of it dried adhering to thehot walls. Owing to the worm-like arrangement of the blades the materialto be dried is simultaneously fed toward the other end of the apparatusb. The material here leaves the drum and falls into the steam-heatedtrough d. A second, slower rotating system of blades g which isjournaled, on the one hand, on the journal 6 of the stationary heatingcylinder 6, and, on the other hand, by means of a ring 6 and rollers,not shown, conveys the material to be dried to the outlet 0 andsimultaneously lifts the said material. The outer blades of the systemor rim of blades 9 push the material lying on the bottom of the troughin front of them until it partly slides olf them at about the positionit in Fig. 1 and falls onto the inner blades therebelow in order to,

be pushed by these blades over the upper part of the stationary cylinderinto the position 71. From here the material slides and falls freely tothe bottom of the trough. The described operation is constantly repeatedso that the material moves from b to the outlet 0 spirally about thedoublewalled drum. The available heating surface is completely utilized,because even the lower, outer part of the cylinder free from materialacts by radiation on the material in the bottom of the trough.

For materials which lose their adhesive properties toward the end of thedrying operation, as for example molasses food-stuffs, beetroot chips,and the like, my hereindescribed apparatus can be made in combinationwith a so-called after-drier. Fig. 2 shows such a combination. Theafter-drier 70, whose employment and construction are known, comprises anon-heated trough Z in which a heater m comprising tubes m moves. Arotating rim of blades n uniformly distributes the material to be driedover the section of the nest of tubes.

I claim 1. In drying apparatus, the combination, with a double-walledtrough, of a horizontal, cylindrical stationary heater centricallymounted therein.

2. In drying apparatus, the combination, with a double-walled trough, ofa horizontal, cylindrical stationary heater centrically mounted therein,and means rotatable in the heater for spirally conveying material'to bedried through the interior of the same.

3. In drymg apparatus, the combination,

with a double-walled trough, of a horizonthe said cylinder to the otherend of the I tal, cylindrical stationary heater centrically trough. 10

mounted thereln, means rotatable in the In testimony whereof, I affix mysignature heater for conveying material to be dried in the presence oftwo witnesses.

through the same to one end of the trough, ALBERT GERLAOH. and meansrotatable about the heater for Witnesses: v i conveying the materialfrom the said end of g WOLDEMAR HAIIPT, the trough spirally about theouter wall of HENRY HASPER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

